Control device



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III-- June 28, 1960 Filed Nov. 5, 1956 J. L. DEVERSE ETAL 2,942,478

CONTROL DEVICE 3 Sheets-Sheet 1 June 28, 1960 J. L. DEVERSE ETAL 2,

CONTROL DEVICE Filed Nov. 5, 1956' v 3 Sheets-Sheet 2 INVENTORS JosephL. Deverse Russ e]! 'B. M11758 June 28, 1960 Filed Nov. 5, 1956 ll L 5ll J. L. DEVERSE ET AL CONTROL DEVICE 3 Sheets-Sheet 3 mmvrozzs JosephL. Deverse Ram-fig B. Mahh ea:

Cl'ff gs U d-Sta s 2w 2,942,478 coNrnoL DEVICE Joseph L. Deverse andRussell B. Matthews, Milwaukee,

Wis., assignors to Baso Inc., Milwaukee, Wis., a corporation ofWisconsin Filed Nov. s, 71956, Ser. Naszasza t '8 Claims. cl.14-2

larly to an improved combination ignition and fuel conj- 2 ofi pilotfuel valve, a manual pilot fuel valve and filter means for the pilotburner fuel supply, said device also having meanstherein forselectivelylatching the safety shut-off pilot valve in open position to render saidvalve non-responsive to pilot outage as desired, thereby pro vidingasingle control device which is usable in either 100% shut off ornon-100% shut-01f applications, while in the field. v

A further object of the invention. is to provide a de-' retaining manualcontrol and filtering of the fuel supply to the pilot burner. in eachapplication.

A further object of the invention is to provide a device of the typeaforementioned having a safety shut-off means as a tfirst majorcomponent and a reset means'as a second major component, and'havingquick detachable means fouoperatively connecting said com ponents tothereby facilitate initial assembly of the de-' vice andquickreplacementof either of said components vice that is sturdy and compactinconstruction, is easily. fabricated and assembled, and isotherwisewell adapted for the purposes for which it was designed.

device having improved reset'means operatively associat I ed with saidelectromagnetic members and said controlling member and including meansfor indicating the relative positions of said electromagnetic membersand the posi tion of said controllingxmemberi";

A more specific object of-the 'invention'is to provide a device of thetype aforementioned Wherein'the means for ind-icatingthe relativepositions of said electromagnetic members takes the form of innerand-outer coaxial resetmembers, the inner of said members having anoperating position retracted within said outer member and in whichposition it is disposed when said electromagnetic members are coupled,said inner member also being movable on release of 'said coupled membersto a release or shut-off indicating position wherein a portion thereofprojects from said outer member to afford areadily visible indicationtofsuch release and} of-the resultant "shut off of the fuel flow controlledby said device. I

Another and more specific object of the invention is to provide in adevice of the aforementioned character,

a secondary or pilot fuel valveas wellas means for con- 1 trolling mainburner fuel flow, said pilot fuel valvehav- 1 ing a closed position andhaving an open position to which it is moved by the resetting movementof the reset means and in which it is held by coupling of saidelectromagnetic members, saiddevice also including switch means inthe'energizing circuit of an igniter for said pilot fuel, said switchmeans being actuatable by "said reset means during a resetting operationto effect ignition of the pilot burner fuel following opening of thepilot fuel valve during the reset movement.

A further object of the invention'is to providea device of theaforementioned general characteristics wherein there is means to preventa reset motion of the reset means when the electromagnetic membersarecoupled to The novel features which are characteristic of theinventionare set forthwith particularity in the appended claims. Theinvention itself, however, both as to its organization and its method ofoperation, together with additional objects and advantages thereof willbest be understood by the following descriptionof the specificembodimentwhen read; in; connection -with the accompanying drawings, inwhich: I t

Figure 1 is a sectional'viewof an embodiment of the invention shown in acontrol system for fluid fuel burning apparatus, partsof said apparatusbeing shown semidi'agrammatically and the partsof the control devicebeing shown in o position; i a a 7 j Figure 2is a framentary sectionalview of a portion of the embodiment shown in Figure 1 indicating therelative positions of parts ;of=the device during a resetting operation,other partsof the device and of the apparatus being shownsemi-diagrammatically; V I Figure 3 is a fragmentary sectional viewsimilar to Figure 2showing the relative positions of the parts inoperative or on position following a successful resetting andignition'operation;

Figure 4 is a right -hand end view of the device shown in Figure 1,parts being broken away and shown in section; I 'J Figure S is aperspective view of one of the members used in the devicedepictedtin-Figures 1 through 4 for connecting the safety shut-off meanscomponent with the reset means component; and I Figure 6 is aperspective view of one of the members used in the device depictedinFiguresl through '4 for selectively latching the pilot burner safetyshut-olfvalve -or space'heater, water heater, floor furnace, gas rangethereby preventunnecessary energization of the igniter circuit tendingto shorten the useful life thereof, and also preventing unnecessaryinterruption of thefuel flow to the main burner. I Z l A further objectof the invention'is to provide a unitary device of the above characterhavin'g'a safety "shutor any other burner." A gas or other fuel supplypipe V I v 30 leads to theburner 12, and'a power actuatedelectroresponsive valve 31 ,suchas a solenoid or other electroresponsivemotor valve as suitable or desired is interposed in the fuel supply pipe30 for control of the fuel flow to burner 12., A room thermostat 40thermostat ically controls the valve 31 in the usual manner.

'A pilot burner 11 is disposed in ignition relation jacent the mainburner 12 and is supplied with fuel through Patented June 28, 1960 otherfuel burner of any 3 a conduit 27. Electric ignition means which maytake the form of a glow coil 9 is disposed in igniting relation to thepilot burner 11, and a thermoelectric generator 46 is positioned to haveits hot junction subject to the heat of burning fuel at the pilot burnerfor a purpose which will become apparent hereinafter.

Means for controlling the fuel flow to and ignition of the main andpilot burners 11 and 12 is provided by a unitary control device. whichmay be disposedremotely from said burners. The unitary control device 10(Figure 1) contains the following: safety shut-01f means 48 'responsiveto pilot burner outage and comprising a first major component, firstcontrol or switch means 14 for controlling the fuel flow to the mainburner, means including third control or valve means 22. and manualvalve 24 for controlling the fuel flow to the pilot burner, secondcontrol or switch: means 15'for actuating the ignition means for thepilot burner, and. reset means 18 comprising a second major componentand' operable for resetting the safety shut-off means and actuating theaforementioned control means, said reset means including indi catingmeans for indicating the status ofthe above named control means and ofthe safety sh11t=oif means 48' as shall later be explained; V

The main burner flow control switch nreans14 is fixedly disposed withina casing 13 of the. control device lilto be. actuated by the reset'means18 and the safety shut-off means 48 through a pivotallymounted lever 70as shall be more apparent later. The switch means 14 controls valve. 31and maybe biased toward a circuit completing position by suitable meanssuch as a' spring 14a. The switch means 14 is connected to the powerunit of valve 31 and to a suitable source 32 (as shown schematically inFigures 2 and 3) by conductors 33, 34, 35 and 36. For purposes ofillustration, it may be assumed that the valve 31 is of the characterthat when the thermostat 40 is calling for heat, the valve 31 will' beactuated to open position by the closing of switch means 14 in the.circuit 33 through 36 and will be held in open position to supply fuelto burner 12 as long as said circuit is closed.

As aforementioned; the control device 10 contains pilot burner controlmeans and is connected to the pilot'supply The switch means 15 forenergizing igniter glow coil 9 to thereby ignite the pilot burner 11, asshown schematically in Figures 1 and 2, may be connected to the glowcoil 9 and the electrical source 32 through suitable conductors such as33, 41 and 42, a ballast resistor 43 and conductors 44 and 36. Theballast resistor 43 located within the device 10 (as shown in Figure 1)and in the aforementioned circuit to the igniter 9, compensates for thechange in the resistance of the glow coil when it is energized as iswell understood in the art. The switch means 15 may be of the type thatis biased toward a closed or circuit completing position by suitablemeans such as spring 15a, and as will become more apparent later, the

7 switch 15 is actuated between controlling positions by the resetmeans. 18 which actuation is translated to the switch means: byreciprocatory movement of a switch pin 15b. p

The safety shut-off means 48 is mounted on a wall of casing 13 andcomprises a generally U-shaped magnet armature 52 is disposed within:the casing '50: for movement to attracted andretracted: positions with:respect to the magnet core 49: An energizing-coil'51 may be disposed oncore 49, and is connected to the thermoelectric generator 46' by acoaxial cable47 whereby when the generator 46 is' heated and coil 51 isenergized the magnet is adapted to hold armature 52 inattracted'relation when the latter is moved thereto.

An armature stem 53 is fixedly attached to ma ture 52 and extendsoutwardlyof the casing 50 to and i through a generally cup-shaped member54 which is n 56. having an annular stop membern56a disposed therepipe27 to control the fuel flow therethrough. The conwith an inletconnection 27a andoutlet connection 271", and

having connecting passages 27b; 27c, 27d, and. 276. The path of pilotfuel flow through casing 13' is from the inlet connection 27asuccessively throughpa'ssage 27b, the filter 21, passage 27c, valve 22,passage 27d, valve 24, and passage 27a to the outlet connection 27;. Asshown; the poppet valve 22 is formed with a stem 22a which engages apivotally mounted lever 75,. said 'valve'being biased toward a closedposition by suitable means such as spring t 28. Under certainconditions,.however, valve 22 may be held in open position against saidbias by condition responsive safety shut-01f means 48 and by reset means18 through said lever 75, in a manner to be hereinafter explained. Latchmeans 89 (shown most clearlyin Figures I- and 6) may also be provided tolatch pilot fuel'valve22 in open position and'thereby render said valvenon-responsive to the safety shut-oif means 48 and' to reset means inwhich abuts the inner bottom surface ofthe cupshaped member 54. Biasing;means such as spring 57 may be disposed surroundingly to the armaturestem 53, with one. end abutting the end of tubular casing 50 and the.other end engaging the outer undersurface of the cup-shaped member 54 tobias the latter against stop member 56a as shown. in Figures'l to 3. Itisto be noted that arrangement afiords a bias of the magnet 49 andarmature 52 towards aseparated relation and also affords a lost motionconnection of the cupshaped member S4relativeto thearmature stem 53,i.e., cup-shaped member 54 may be moved downwardly with respect to thearmature stem to expose the groove 55 for quick detachment purposes asshall be explained more fully later. The outer upper surface of thecupshaped member 54 is formed with an annular camsurface 54b which isadapted to engage the pivotally mounted pivot valve lever 75 moving thelatter upon engagement therewith to open valve 22 against the biasof'spning 28 as shall become apparent.

Special attention is directed to the fact that the distance between thearmature 52 and the core 49 is preferably so great when said armatureand magnet are in separated relation (as shown in Figure 1), that evenwhen magnet" 49 is energized, it has insuflicient attractive force tomove the armature 52 from its retracted position 18. The latch means 89may take the form of an elo'ngated spring strip 90 one end of whichislfixedly mounted against the bias of spring 57.

Means for resetting the armature 52 toward attracted relation with. amagnet 49 is provided by the concentric reset means indicated generallyby the numeral 18. As shall become apparent during the description ofthe operation, the reset means 18 also affords during resettingactuation of valve 22 for pilot burner fuel flow, actuation of switchmeans 15 for ignition of'the pilot burner fuel, and actuation of switchmeans "14 preventing operation of the main burner flow control meansduring resetting. In addition, the reset means 18 affords means forindieating the status of components of the device after the 13b andforms a stop shoulder for purposes hereinafter appearing. V l p Resetmeans 18 comprises a pair of or first andsecond relatively movableconcentric reset members indicated generally by the numbers 60 and 61coaxially disposed within bores 13b and 13s. The outer reset member 61may be formed of two portions 61a and 61b which are rigidly attached at610, the general appearance of member 61 being that of asleeve. =Portion61b is formedwith an axial bore 61d and portion 61a is formed withlarger axial bore 61a. The lower end of portion 61b may be formedlwitha, counterbore 61f which together with bore 61d defines a stop shoulder61g. The inner end of portion 61b is formed with a portion 61h ofenlarged outer diameter, forming an annular stop shoulder -61i whichoverlaps and coacts with stop shoulder 13a to limit the outward movementof member 61. Portion 61g terminates in an annular inner end surface61k, and the junction of said end surface with the peripheral surface ofthe enlarged portion 61h is preferably relatively sharp, ratherthanrounded, for purposes hereinafter appearing, The larger diameterportion 61a of member 61 may to bias the members 60 and 63 in oppositeaxial direc tions and thereby bias the stop collar 72' toward engagementwith the coupling member 63 as shown in Figures 1 m i and 3.

As shall become more apparent in the description of the operation of thedevice, the reset members 60 and 61 havefirst and second positions withrespect to each other corresponding respectively tothe relativeattracted W and retracted positions of the armature 52. The secondrelative position is assumed by said reset members in the off positionof the control shown in Figure 1 wherein the portion 60b of member 60projects from the member 61. The first relative position of the resetmembers is assumed when said members are depressed to afford the resetposition of the control shown in'Figure 2 wherein reset members 60 and61 and casing 13 are all flush, and in the cocked and energized or onposition of the control shown in Figure 3 wherein the reset members 6tand 61 are flush with each other, and both are The member 63 ispreferably formed with an annular rounded corner portion 630 forming asurface'for engaging a pivotally mounted switch lever'i'tl as best hownin Figure 3.; The open end of member 63 may be closed by a transverselydisposed disc 63d which is rigidly be formed with a coaxial annulargroove 61p extending outwardly from the inner end thereof. The groove61p is adapted to receive a helical biasing spring 67 having one endabutting shoulder 13f and the other end bottoming in said groove to biasshoulder 61i into engage ment with shoulder 13c as shown in Figure 1, lThe mid section of portion 61b is defined by a wall surface 61 and isadapted to slidably move within bore 13b with a reciprocatory movementto bemore fully explained. The axially outward surface 61 of the portion61b is formed with a reduced diameter portion 61m to provide an annularcam shoulder 6111. The cam shoulder 6172 is adapted to move into and outof registry with transverse bore 13d for coaction with switch pin 15b ofthe igniter switch 15, so that when member 61 moves axially outwardlystop shoulder 611' moves into engagement with boss shoulder 13a (asshown in Figure 1), the cam shoulder 61n cams pin 15b outwardly (to theleft in Figures 1 to 3), and Wall surface 61 thereafter maintains pin15b in an outward or circuit-breaking position as long as the member 61is in its outermost position. On the other hand, when the member 61 ismoved toward the inwardly depressed position shown in Figure 2, wallportion 61 and shoulder 61h move out of registry with opening 13d, andpin 15b moves to the right as viewed in Figures 1 to 3 under the bias ofspring 15a, to thereby close the switch 15 and energize the ignitercircuit.

The inner reset member is formed with an enlarged head portion 60a whichmay if desired be painted a color contrasting with the color of theportion 61a of member V 61. Member 60 also has an elongated stem 60bwhich slidably fitswithin the axial bore 61d of the outer reset member61. The enlarged head portion 60a is slightly smaller than bore 61c andis slidably movable therein. The stem 60b may have its inner endreducedat 600 to provide an annular shoulder 60a and extends downfixed thereto.7

The coupling member has successively reduced outer diameter portions 63jand 63k forming annular shoulders 63n and 63m shown most clearly in theperspective view of Figure S. The side wall portion 63k of member 63 isformed with a generally U-shaped axiallyextending slot 63 and end member63d is formed with a narrower radial U-shaped slot 63e in registry withslot 63 as shown in'Figure 5. Suitable locating means 63g may beprovided to correctly locate member 63d with respect to member 63 sothat slots 63e and 63 are aligned. Indicating means such as groove 63:may be formed on member 63 in axial alignment with slots 63e and 63 forease in assembly.

As shown in Figures 1 to 3, the slot 63e is adapted to receive thegrooved portion 55 of the armature stem 53, but is smaller in width thanthe diameter of end portion 53a of said stem. The slot 63 (Figure 5) iswide enough to permit entry therethrough of the stem end portion 53a.The coupling'member 63 thus provides quick detachable means forconnecting the armature stem 53 to reset member 60. The indicating means631 indicates the positionof slots 63c and 63f when the latter arehidden from view by the cup-shaped member '54 which telescopically fitsover the portion 63k of member 63 p when the device is assembled, andengages shoulder 63m asshown in Figures 1 to 3. The axial length ofsurface 7 portion 63j is the distance between shoulder 63m and 63m Iaffords-a spacing between member 54' and shoulder 6311 sufficienttopermit insertion of the fingernails of an operator, a screw driver orother suitable tool forpryingsaid members apart to afford access to theinner parts for assembly or disassembly of the reset and safety shut-offmechanisms. I

The operation of the improved apparatus is as follows:

Assume the following initial conditions, the various preventingposition, disc valve 24 open, coupling member'63 engaging inner endsurface 61k'ofmernber 60,

i.e. being in a first relativeposition with respect thereto,

Specifically, the condia so as to retain cam lever 70 in the outwardlyswung switch actuating position shown to thereby maintain switch 14 opento maintain an open circuit to the main burner valve 31, switch pin 15bengaging the surface-ofportion 61 of the reset member 61 and heldthereby in switch actuating position to maintain an open ignitercircuit, and portions 61a and 60b of reset means 18 projecting outwardlybeyond the plane of the casing 13 under the bias of springs 67 and 57,with portion 60b of reset member 60 projecting from the portion 61a ofmember 61 to thereby indicate the deenergized status of the safetyshut-off means and the relative off positions of the parts.

To start the device in operation, the disc valve 24 in the pilot line ischecked to make sure it is in flow-permitting position, so that fuelflow in the pilot supply line 27 is completely under the control ofvalve 22, when the latter is in the unlatched (normal) position shown infull line in Figure 1. When 100% shut-off is not desired, lever 75 islatched into the position shown in dashed lines by springing arm 90upwardly and slipping lever 75 under detent 91. This removes valve 22from control of the safety shut-01f means 48 and reset means 18 forapplications where 100% shut otf is prohibited while retaining manualcontrol and filtering of the pilot fuel supply. To reset the device andthereby initiate operation of the fluid fuel burning apparatuscontrolled thereby, indicating reset member 60 and outer reset member 61are manually depressed to the position shown in Figure 2. The inwardreciprocatory movement of the member 61 is transmitted to the armaturestem 53 through the coupling member 63 to thereby move the armature 52into engagement with magnet 49. During the first part of the resetmovement, the inner reset member 60 is moved from the position shown inFigure 1, to a transitory flush position (not shown) with reset member61. This movement is taken up entirely by compressing the spring 65 withno other parts moving. Upon the inner members 60 becoming flush with theouter reset member 61 said members move simultaneously.

No fuel may flow to the main burner during the reset movement as inwardmovement of the reset members 60 and 61 does not affect the open switch14 in circuit to the main burner flow control valve 31 inasmuch as theswitch lever 70 remains cammed toward its initial position by portion6112 of member 61 during said movement. Thus switch 14 remains incircuit interrupting position during depression of the reset members 60and 61.

Fuel to ignite the pilot burner is provided by the aforedescribedresetting movement, since the member 54 moves with the coupling member63 to cause the cam surface 54b thereon to engage pilot valve lever arm75, swinging the latter to the right as viewed in Figures 1 to 3, tothereby open valve 22 against bias of spring 28. Lever 75 is held in itsflow-permitting position by the coupling member 63 as long as thearmature 52 remains in attracted position with respect to the magnet 49affording continuous pilot gas flow as long as said lever and the valve22 are so actuated.

The igniter 9 is energized to ignite the pilot burner 11 by the inwardreset movement of the member 61 allowing switch 15 to close. This occursupon the removal of portion 61 of said member from engagement with thehead of switch pin 15b, allowing the pin to move to the right to theposition shown in Figure 2. Thus, the igniter circuit is energized fromsource 32 to provide ignition of the'fuel emanating from the pilotburner 11. Ignition of the fuel at the pilot burner 11 heats thethermoelectric generator 46 to cause the latter to generate a currentwhich energized electromagnet coil 51. Energization of coil 51 isoperable to retain the armature 52 in engagement with magnet 49 againstthe bias of spring 57.

Upon release of the reset means 18 the entire reset means will move fromthe position shown in Figure 2 outwardly to the position shown in Figure3 under the bias of springs 67 and 65. Outer reset member 61 is therebyreturned to its initial position, i.e. with shoulder 61: engagingshoulder 132. Inner reset member 60, however, may. move outwardly onlythe distance required to move stop collar 72 into engagement-with theinner surface of coupling member 63. When stop member 72 does so engagesaid inner surface under the bias of spring 65, the head 60a of innerreset member 60 is positioned substantially flush with member 61a asbest shown in Figure 3 and said member 60 is held in this position bythe'armature 52 acting through coupling member 63 and stems 53 and 60b.It is to be noted that the relative position'of members 60 and 61 shownin Figure 3, i.e., the projected flush position wherein the head 60a isunobtrusively retracted within the member 61a, affords meansindicatingthat the parts are in on position.

Upward return movement of the reset means 18 also causes a separation ofcoupling member 63 and end surface 61k of reset member 61 to afiord asecond relative position of said members as shown in Figure 3, sincemember 63 is attached to the armature stem 52 and is held therebyagainst following movement. This separating movement allows switch lever70 to move in a clockwise direction under the bias of the spring 14a,closing switch 14 and thereby placing the circuit to the main burnerflow control means under the exclusive control of the cycling thermostat40.

The upward return movement of the reset means 18 also causes the ignitercircuit to reopen by virtue of the cam action of shoulder 6111 on themember 61 reengaging and camming outwardly (to the left as viewed inFigures l to 3) the head of the igniter switch pin 15b.

It will be observed that the switch lever arm 70 is formed with a orbend 70a (Figures 2 and 3) which is preferably such that in the cockedenergized on position of the parts shown in Figure 3, the lever 70 andthe reset mechanism are interlocked so that the member 61, and hence themember 60 are held against further inward reciprocatory motion. Thus itis not possible to reclose the circuit to the igniter 9 or to reopen thecircuit to the main burner valve 31 by depression of the reset meanswhen the-magnet and armature are cocked and energized, since alldownward motion is prevented until cam surface 630 moves lever 70 in acounterclockwise direction in response to pilot outage as willhereinafter appear.

It is also to be noted that the armature 52 will be reset to engagementwith the magnet 49 by depression of either the inner reset member 60 orthe outer reset member 61, singly, or as aforestated when they aredepressed simultaneously. When the inner reset member 60 alone isdepressed, motion is transmitted to the armature stem 53 through theabutting connection of the under side of the enlarged head portion 60ato member 61 at 2a, through coupling member 63 to the armature stem Uponpilot burner outage the generator 46 cools, and coil 51 on the magnet 49deenergizes, releasing the armature 52 under the bias of spring 57, andcausing outward movement of coupling member 63, i.e. upward movementthereof as viewed in Figures 1 to 3, thereby returning the parts to theinitial position as shown in Figure 1. Outward movement of member 63causes rounded cam portion 63c thereof to cam the lever arm 70 in acounterclockwise direction to thereby open the circuit to the mainburner flow control means 31 and effect shut ofi of all fuel flow'to themain burner 12. Simultaneously, pilot fuel flow is shut ofi by thereturn of lever arm 75 to the position shown in Figure 1 affordingclosure of valve 22 under the bias of spring 28.

Although a specific embodiment of the invention has been shown anddescribed it is with full awareness that many further modificationsthereof are possible. The

invention therefore is not to be restricted except insofar as isnecessitated by the prior, art and by the appended claims. 7,

a What is claimed bythe invention is 2 H p 1. In a control device, firstand second resettablemernbers biased toward'separated relation andmovable toward an engaged relation, a'reset member biased toward areleasedposition and 'actuatable to a reset position and operable tomove said resettable members toward engaged relation by movement toreset position, and means having operative connection with at least oneof said first and second members including a member mounted for movementto an obstructing position preventing actuation of said reset memberfrom released toward reset position but only when said resettablemembers are in engaged relation, said connection effecting movement ofsaid member to a non-obstructing position with movement of saidresettable members toward separated relation.

2. In a control device,,first and second resettable members biasedtoward separated relation and movable toward an engaged relation, areset member biased toward 'a released position and actuatable to areset position and operable to move said resettable members towardengaged relation by movement to reset position, and control means havingoperative connection with at least one of said first and second membersfor movement of said control means from one to another controllingposition by movement of said resettable members from engaged towardseparated relation, the operative connection for said control meansincluding a member mounted for movement to an obstructing positionpreventing actuation of said reset member from released toward resetposition but only when said resettable members are in engaged relation,said operative connection effecting movement of said obstructing memberto a non-obstructing position and movement of said control means to itsother controlling position with movement of said resettable memberstoward separated relation.

3. In a control device, first and second resettable members biasedtoward separated relation and movable toward an engaged relation, areset member biased toward a released position and actuatable to a resetposition and operable to move said resettable members toward engagedrelation by movement to reset position, control means having operativeconnection with said reset member and actuatable from one to anothercontrolling position by actuation of said reset member, and means havingoperative connection with at least one of said first and second membersincluding a member mounted for movement to an obstructing positionpreventing actuation of said reset member from released toward resetposition and thereby preventing actuation of said control means but onlywhen said resettable members are in engaged relation, said operativeconnection for said obstructing member efiecting movement of the latterto a non-obstructing position with movement of said resettable memberstoward separated relation.

4. In a control device, first and second resettable members biasedtoward separated relation and movable toward an engaged relation, areset member biased toward a released position and actuatable to a resetposition and operable to move said resettable members toward engagedrelation by movement to reset position, first control means 'havingoperative connection with said reset member and f gas es meansibut onlywhen said resettable members are in eri-j member tov a non-obstructingposition and movement of c said second control means to its othercontrolling posia tion with' movement of said resettable members towardseparated relation. t

5. In a control device, first and second members biased toward aseparated relation and resettable to an engaged relation, reset meansfor resetting said members toward said engaged relation comprising firstand second reset members each movable to a reset and biased toward areleased position, one of said reset members being freely movableindependent of said resettable members, and means affording alost-motion connection between the other of saidreset members and atleast one of said resettable members preventing return of said otherreset member to its released position following a resetting operation solong as said resettable members are in engaged relation.

6. In a control device, a power unit comprising first and secondmagnetic members biased toward a separated relation and resettable to anengaged relation, a reset assembly for resetting said members towardsaid engaged relation comprising first and second reset members eachmovable to a reset and biased toward a released position, one of saidreset members being freely movable independent of said resettablemembers, and means afiording a quick detachable lost-motion connectionbetween the other of said reset members and one of said resettablemembers preventing return of said other reset member to its releasedposition following a resetting operation so long as-said resettablemembers are in engaged relation, and permitting quick removal andreplacement of either or both of said reset assembly and power unit.

7. In a control device, first and second members biased toward aseparated relation and resettable to an engaged relation, reset meansfor resetting said members toward said engaged relation comprising firstand second reset members each depressible to a reset and biased in theopposite direction toward a released position, one of said reset membersbeing freely movable independent of said resettable members, meansafiording a lost-motion connection between the other of said resetmembers and at least one of said resettable members preventing return ofsaid other reset member to its released position following a resettingoperation so long as said resettable members are in engaged relation,control means having operative connection with said one reset membereflzecting disposition of said control means in one controlling positionor another in accordance with the position of said one reset member,means having operative connection with at least one of said resettablemembers including a member mounted for movement to an obstructingposition preventing depression of said one reset member and actuation ofrelation, reset means for resetting said members toward said engagedrelation comprising first and second reset members each depressable to areset and biased in the opposite direction toward a released position,one of said reset members being freely movable independent of saidresettable members, means affording a lost-motion connection between theother of said reset members and at I least one of said resettablemembers preventing return of said other reset member to its releasedposition following a resetting operation so long as said resettablemembers I I are in engaged relation, control means having operativeconnection with said resettable members and movable from one controllingposition to another by movement of 5:

said resettable members from engaged to separated relation, saidoperative connection including a member movable to an obstructingposition preventing depression of said onereset member but only whensaid resettable members are in engaged relation, saidconnectioneffecting movement of said obstructing member to a nonobstructingposition and saidicontrol means to its other controlling position withmovement of 'said resettable member toward separated relation.

12 References Cited in the file of this patent UNITED STATES PATENTS1,626,147 Moser Apr. 26, 1927 2,501,850 Kunzler Mar. 28, 1950 2,601,321Ray June 24, 1952 FOREIGN PATENTS 1,033,659 France July 15, 1953

